body {
  flex-direction: column;
  justify-content: space-between;
}
body .header {
  width: 100%;
  height: 200px;
  background-color: antiquewhite;
}
body .main {
  flex: 1;
  background-color: aqua;
  padding: 10px;
}
body .footer {
  width: 100%;
  line-height: 77px;
  justify-content: space-around;
}
